TI 81 Range Program
This program is handy for graphs which you would like to trace. Usually when
tracing, all of the values are long decimals. To alleviate this, the range of
x should be a multiple of 19 (The one we are using is -28 to 29 with a scale of
3) and the range of y should be a multiple of 7 or 9 or both (we used -31 to
32, also with a scale of 3). This program automatically enters the range and
scale values for you.
prgm 6:Range
:-28 -> Xmin
:29 -> Xmax
:3 -> Xscl
:-31 -> Ymin
:32 -> Ymax
:3 -> Yscl
:end
Entering the program:
Underlined words represent buttons to press
# represents the cursor
Keystrokes Screen
PRGM
cursor across to EDIT
cursor down to next empty PRGM
ENTER PRGM 6:#
RANGE ENTER PRGM 6:RANGE
:#
-28 STO :-28 #
VARS cursor over to rng
select 1 (Xmin) ENTER :-28 -> Xmin
29 STO :-29 #
VARS cursor over to rng
select 2 (Xmax) ENTER :-28 -> Xmax
3 STO :3 #
VARS cursor over to rng
select 3 (Xscl) ENTER :3 -> Xscl
-31 STO :-31 #
VARS cursor over to rng
select 4 (Ymin) ENTER :-31 -> Ymin
32 STO :32 #
VARS cursor over to rng
select 5 (Ymax) ENTER :32 -> Ymax
3 STO :3 #
VARS cursor over to rng
select 6 (Yscl) ENTER :3 -> Yscl
:#
PRGM
cursor down to 7 ENTER :END
To run the program just hit PRGM and cursor down to the range program and
hit ENTER again twice. This will automatically make the next graph you display
will be easily traceable.